X0306 4 2019-12-23 0 0000929008 WESCO INTERNATIONAL INC WCC 0001183545 GRIFFIN BOBBY J 225 WEST STATION SQUARE DRIVE SUITE 700 PITTSBURGH PA 15219 1 0 0 0 Deferred Share Units 2019-12-23 4 A 0 1048.6695 0.00 A Common Stock 1048.6695 6670.1983 D Deferred Share Units are credited to an account in the reporting person's name maintained by WESCO International. Each Deferred Share Unit is the economic equivalent of one share of WESCO International common stock. The Deferred Share Unit Account balance becomes eligible for distribution, only in the form of WESCO International common stock, upon termination of service as a Director. /s/ Samantha L. O'Donoghue, Attorney-In-Fact 2019-12-23